So my friend has an ap1 03 with tracy sports exhaust and header and test pipe..

he is getting a code p0133 and he gets a popping sound kinda like fuel cut when he goes past 6k or so..(it will still go to redline).
he has a antifouler in the test pipe..

why you think its doing it.

 

Does it have the O2 sensor "mechanical simulator"?

 

yep.

 

The popping is unspent fuel detonating in the header or cat.

 

he says it kinda stutters..

 

Here's what Alldata (tech shop aid) says.


Check for a Temporary DTC with the scan tool. Is Temporary DTC P0133 indicated? YES - Replace the primary HO2S (Sensor 1). NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the primary HO2S (Sensor 1) and at the ECM.


I would say the O2 sensor is still getting too hot. Probably not a bad sensor at this point.


another edit* just read you're using the simulator, not backing the sensor off. Probably a problem with it reading on the computer.

 

what is this code ? might help some of us less familiar with s2k but know cars....sounds like someone said backfire from unburnt fuel